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12/5/78 AC 150/5300-4B CHG 3 Appendix 8 60 feet (18 m); for large two- and three -engine jets, other than basic transports, and all large propeller driven airplanes make the radius 80 feet (24 m); and for large four -engine jets, other than basic transports, make the radius 110 feet (33 m). For aircraft over 300,000 pounds (136 000 kg), an analysis of the turning area required for the aircraft will be necessary to determine adaptability to the dimensions specified herein. d. The Type II compass calibration pad shown in Figure 3 provides wheel slots to assist in true alignment of aircraft normal to each radial. It may be desirable to construct a special device for use in obtaining true alignment when the calibration pad shown in Figure 2 is constructed. One method which may be used is to establish control points consisting of hollow shell non- magnetic inserts along each radial. A wooden block with aluminum or bronze bolts to fit into the center hold of the brass insert can then be used to provide an accurate alignment of the aircraft wheels. Design details of this system are shown in Figure 1. e. There are many satisfactory ways of providing a device to wheel - block an aircraft to obtain the required alignment, and the exact method is left to the discretion of the design engineer. The method detailed in Figure 1 is one suggestion. One alternative which comes to mind is the possibility of forming holes in the concrete with some form of removable dowel, rather than construct- ing the specially built brass inserts. 5. LOCATION OF COMPASS CALIBRATION PAD. The requirements specified herein have been determined through consultation with instrument calibration specialists, fixed base operators, and persons in the Geological Survey with considerable experience in performing surveys of compass calibration pads. a. Locate the site at least 300 feet (90 m) from power and communication cables (both above and below ground) or from other aircraft. Locate the site at least 600 feet (180 m) from large magnetic' objects such as buildings, railroad tracks, high voltage electrical transmission lines, or cables carrying direct current (either above or below ground). In order to prevent interference with electronic navigational aid facilities located on the airport, make sure that the required clearances are maintained as specified in AC 150/5300-2. Control cables, runway and taxiway light bases or sign fixtures, pipelines, ducts, grates for drainage, distance remaining signs, and aircraft arresting gear should be avoided when they contain ferrous materials. b. The compass calibration pad must be located off the side of a taxiway or runway a sufficient distance to satisfy the runway and taxiway clearances applicable to the airport on which it is located. * Par 4 Page 3